CC_turtle_!excavate_(non-working)

--!excavate
--This clears a fully customizable area
print("This code clears a customizable room that is one block above and below the turtle")
print("I need an enderchest in slot one")
sleep(1)
print("")
print("I dig down boss")
sleep(1)
print("I dig layers 3 blocks high")
print("How many layers am I digging?")
z=tonumber(read())
print("Left or Right from where I'm facing? (L/R)?")
u=read()
b=0
print("How many blocks forward?")
x=tonumber(read())-1
print("How many blocks wide?")
y=tonumber(read())
for k=1, z, 1 do
 if k==1 then
  t.down()
  t.down()
  t.digDown()
  b=b+2
 else
  t.down()
  t.down()
  t.down()
  t.digDown()
  b=b+3
 end
 if u=="L" or "l" then
  u=2
 elseif u=="R" or "r" then
  u=1
 else
  print("Incorrect input, restart and try again!")
  break
 end
 if (x*y*z+4*z)<=turtle.getFuelLevel() then
  modem.transmit(channel, 128, "Minion "..os.getComputerLabel().." has started strip mining!")
  v=1
  for j=1, y do
   for i=1, x do
    t.forward()
    t.digUp()
    t.digDown()
   end
   if turtle.getItemCount(16)~=0 then
    shell.run("ender")
   end
   if j==y then
    t.right()
    t.right()
   else
    if u==1 then
     t.right()
     t.forward()
     t.digUp()
     t.digDown()
     t.right()
     u=2
    elseif u==2 then
     t.left()
     t.forward()
     t.digUp()
     t.digDown()
     t.left()
     u=1
    end
   end
   modem.transmit(128, channel, "Minion "..os.getComputerLabel().." has finished layer "..j.." of "..z.." sir!")
  end
 else
  print("Not enough fuel Boss!, refuel me please!")
 end
end
for o=1, b, 1 do
 t.up()
end
modem.transmit(channel, 128, "Minion "..os.getComputerLabel().." has finished chunk stripping!")